class B {
	int n;
	static int sum=0;
	void setN(int n){
		this.n=n;
    }
	int getSum() {
	for(int i=1;i<=n;i++)
	sum=sum+i;
	return sum;
}
}
	public class xiti3 {
	public static void main(String args[]){
		B b1=new B(),b2=new B();
		b1.setN(3);
		b2.setN(5);
		int s1=b1.getSum();
		int s2=b2.getSum();
		System.out.println(s1+s2);
}
}
	